Kiln.



No. 645,207. Patented Mar. I3, I900.

' J. &. LENGSHOLZ.

KILN.

(Applicaton filed Nov. 12, 1897.)

(No Model.)

Sauna {ow Z6 SZQZC I tto zww c G in? my W Z UNITED STATES PATENT OFFICE.

JOSEF LENGSI-IOLZ AND CHRISTIAN LENGSHOLZ, OF PORZ, GERMANY.

KJYLN.

SPECIFICATION forming part of Letters Patent N0. 645,207, dated March 13, 1900.

Application filed November 12, 1897. Serial No. 658,335. (No model.)

To all whom it may concern.-

Be it known that we, J OSEF LENGSHOLZ and CHRISTIAN LENGSHOLZ, manufacturers, subjects of the King of Prussia, Emperor of Germany, and residents of Porz-on-the-Rhine, near Cologne, in the Province of Rhineland and Kingdom of Prussia, Germany, have invented certain new and useful improvements in blue-damp kilns for cooling the same rapidly without admission of air, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention in question refers to an improvement in the so-called blue-damp kilns for the manufacture of earthen goods (tiles, earthen pipes, earthenware, &c.) for cooling the same in the shortest time and Without'admission of air in order to attain an equal and fine coloring of the goods.

In the drawings, Figure 1 is a vertical transverse sectional view of a blue-damp kiln embodying improvements of our invention, the view being taken on line 00 a: of Fig. 2. Fig. 2 is a top plan view of our improved kiln. Fig. 3 is a vertical transverse sectional view taken on the line y 3 of Fig. 2.

A are the side walls of the kiln; B, the vault; 0, the outer walls carried up beyond the vault, which inclose the layer of earth D, laid above the vault B.

In the vault B a number of openings 0 are made, into which tube-pieces R are arranged in such a manner that they end below with the inner surface of the vault 13. Over each tube-piece R a cowl H, considerably higher and wider than the opening, is placed with the open side downward, so that its lower rims are shut off air-tight by the earth layer D. Into the tubes R valves K are arranged, which by means of a rod S and a handle G can be so turned from the outside that they either completely shut ed the tubes transversely or open thesame more or less. During the baking these valves are kept shut, so

that no heat from the oven can escape, so that and now the heat passes from the oventhrough the tubes E into the iron cowls H.

These latter are considerably larger than the tubes R, sothat the heat streaming out is diffused over a large surface, thus preventing a glowing of the cowls H.

The number and size of the openings 0 of the tubes R and the cowls H correspond, of course, to the size of the kilns.- If, for example, the openings in the vault B have a diameter of about four hundred and fifty millimeters, (equal to about eighteen inche's,) the cowls H may with advantage be about nine hundred millimeters (equal to about thirty six inches) in diameter.

The advantages which this method of dry damping has over the former methods, especially over the most usual wet method,are selfevident and consist especiallyin the economy of coal, saving the kilns, the equal burning.

and coloring of the earthenware in the kilns, whereby the loss on damaged or too-softly burned goods is almost entirely avoided, and, finally, in the more rapid cooling, and consequently better working, of the kilns and in the very simple operation of the same.

\Vhat We claim as our invention, and desire to secure by Letters Patent, is-

In kilns for burning earthenware, and the like, thevault B; openings 0; a valve R in each opening 0; and a cowl H surrounding each opening 0, substantially as set forth.

JOSEELENGSHOLZ. CHRISTIAN LENGSHOLZ.

Witnesses:

WILLIAM H. MADDEN, CHRISTINE PFEIFFER. 

